Undercutting-saw guide



Dec. 11, i923. 1,476,815

F. HALVORSEN UNDERCUTTING SAW GUIDE Filed April l2, 1922 faktor/ue 1.3

nnirsnsrares SEATTLE, WASEHNGTON, ASSGNOR G3? ONEHAL? T0 'HJLMAR Si HANSO, 0F SEATTLE, VASHINGTON.

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UNDERCUTTNG-SAW GUIDE. l

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Ee it known that I, Fnnnmi HALVOR sin, a subject of thelii dem of Norway, and resident of the city of Seattle, 'n the county of King and State of llashir yon7 .have Ii; vented certain new and useful linproveinents in ndercuttingaw Guides, of which 'the following is a specification.`

` My to be attached to an axe handlefor the pun pose of guiding and supporting a saw thereupon in undercinttingY a log.

fill suo-h devices heretofor produced have been useful only when the saw was placed in certain unnatural positions, anduseless when in other positions, or else they required considerable adjustment and were of com-` plicated design. It is my objeotlto produce a very' simple, light device which will aecoi; ilish the desiredresult, and one which may oe attached to the axe while the latter in its most natural position in the log, being' that position best adapted to hold the are. 'j j f it is also myobject to produce such a device -.vliicliV will properly guide the saw and support it from the axe handle when the latter is in any one of a number of different j aositions, all without complicated adjustments. j u j ji still further obj eet is to produce such u device which will have few parts, and will have these so arranged that they cannot be lost ofi, j Y' ily invention comprises those novel parts and combinations thereof which are shown in the accompanying drawings, described in the speeiiication, and particularly defined by the claims terminating the saine.

ln the acccmpanyingV drawing` l have shown my invention in the forni which is now preferred by me.

Figure l is a plan view of a log beingl undercut, and Figure 2 is a cross-section thereof, showing mydevice in use.

Figure 3 is a plan view of the device itself, and Figure 4. is an end-elevation thereof.

ln order to facilitate the movement of the saw over its support, and to guide it, suoli devices commonly employ a grooved roller, and l have therefor provided thegrooved roller l, this beingjournaled upon an arm hviously, as the roller is only used to reduce friction, the arm l alone might be emplayed,v Y

invention relates toa device intended j The groove il in the roller, or in the arm 2 if the roller is omi ted, must he in a plane j ,v which Yis normal to the axis of the log L being out, or otherwise the edge of the sau' vS will bindl therein, or be thrown to one side so that the out will be made at an angle vertically or horizontally, or both.

Suchv devices are commonly supported upon the handle of an'axe -driveninto the log', to gain theadvantage of the'spring of the axe handle.4 I have therefore shown an axe Ajdriveninto the log L, its handle extending' outwardly and downwardly with respect to the axis ofthe log L. rlhis is the natural position for suchan axe to occupy, when driven in by Aa right-handed sawyer or becker working from' partially beneath the log. Further, suc-h a position of the executs the fibers ofthe log, an-:l hence it is held most firmly therein.

VvWith imnierV appliances it has not been possible, without complicated adjustment, to

vemploy an axe thus naturally driven into the dog, and in therwoods heavy, complicated appliances which can be adjusted for. such positions cannot be .carried about, and parts are liable to he broken or lost, rendering` Vthe device useless. I have therefore supported the arm 2 directly in a head 3:?, from which it projects laterally, the'head 32 forming an integral portion of a elevis 3 which is adapted to be clamped upon the handle H. The particular clamping means is unimportant, being shown as the clamping screw 30 havingY a swiveled'handleengagging tip 3l.

ln Vorder to .correct the outward inclination of the handle H the head 32 is angularly 'positioned relative to the general plane of the clevis 8; that is, it extends laterally from such plane at about the angle the a-Xehandle .ll would naturally maire with the log axis as seen from above. (See Fig. l.) ln order to correct for the handles downward inclination, and finally to bringjr the `groove 11 into a plane perpendicular to the logs axis, the arm 2 is extended from the head 32 which supports it at an angle to the general plane of the clevis 3 and its head 32, or inclined towards the opposite end ofthe clevis. (See Fig. Ll.) This inclination would ordinarily be at about the downward angle naturally assumed by the axe handle as seen from the side.

Heretofore I have described the arm 2 as f and les'in a p y of the log L. Stop surfaces'Ql upon the vthe head 32, to een* etly position though ha Wesel-ign with the head se, and it might be so orifnecrl.k I greatly prefer. however, that the arm be pivoted in the vhead to swing` intofother positions corresponding to various `positions of the-axe iandle. The pivot' pin 23 extendsrin the general angulardirection ofthe head 32, plane perpendicular to the axis arm 2 engage'coopereting surfaces upon the arm 1n aXe isdfriven'in left-hndedly, andext'ending downwarchthe opening' of the cl'evis remains-towards the log, but vt-he arm 2 is thrown over into its other extreme position, again'V bringing A the groof'e il into the proper' plane. Variations in the outward inclination of the axe can be compensated for by turning the @levis about theV axis 'of the clamping screw 30.

What I' claim as Vmy invention is: l. An' undeicutting-'saw guide comprising` a elevis adapted t'heseeu'red to an axe handle. an integrall head angularly positioned with respect to the general plane of the clevis, and la guiding' and'supporting arm carried by said head.

2. 'An undercutftin'glsaw 'guide comprising a clevis adapted'to he secured to an axe handle, a head extending laterally at an angle trein the general plane of the elevis, and a 'guitling'and supporting /arin extending laterally from'Y said head and inclined to- W'ard's the opposite end of the clevis.

3. An undercuttingV-saw guide coinprising` acleviswadapted to he secured to an axe iandle, a head extendingv laterally at an angle 'from the general plane oi? the clevis at one end thereof, a guiding and supporting arm pivoted in said head to lie upon either side oi the clevis, and a stop surface upon the head to position said arm inclined down wardiy towards thel opposite end oi the clevis upon either side thereof.

4. An undercutting-saw guide comprising a clevis adapt-ed to be secured to an axe handle, a head upon one end of the clevis and extendingr at an angle to the general plane thereof, a guiding,r and supporting grin pivoted upon said head, its pivot axis extending in the saine angular direction ne the h ad, cooperating stops upon said arln and head whereby said arin may he positioned in two extreme positions removed more than 180O troni each other at opposite sidesl of the plane ol the clevis, and :i grooved relier journaled upon said arm.

5. In an undercutting-saw luitleg the cour hination with a guiding :1nd supportingarin adapted to extend substantially parallel with the axis of the logr to he cut, of .1 clevis adapted to he secured upon an axe handle extending downwardly and out wardly with respect to the log*r axis, and a head integral with said clevis and angularly positioned relative to its general plane, and forming" a support for said arm. y

6. In an undercuttinglsaw lguide, the coluhination with a guiding1r 'and snpportinpr arm adapted to extend substantially parzillel with the axis of the lo; to be cut, of a clevis adapted to be Secured upon an axe handle which extends downwardly and out wardly with respect to the log:l axis, and u head ii'itegral with said clevis and having :1 pivotal support for an end ol said nrxn adapting' it to he swung tn another position about the head, the axis of said pivot cxtending'at an angle to the general plane if the clevis and lying in a plane suhstantially nornial'to the log axis.

Signed at Seattle, King County, \Vnshington, this 6th day of April. i922. Y

FREDRTK HA LV( WHEN. 

